License and Development Agreements	12 Months Ended
Dec. 31, 2025
Revenue from Contract with Customer [Abstract]
License and Development Agreements	License and Development Agreements Co-Development and Commercialization Agreement with CanSino Biologics, Inc. The Company entered into a co-development and commercialization agreement with our collaboration partner CanSino Biologics, Inc. ("CanSinoBIO") with respect to the development and commercialization of the Company's modifier gene therapy product candidates, OCU400, OCU410, and OCU410ST. The co-development and commercialization agreement was originally entered into in September 2019 ("the Original CanSinoBIO Agreement") with regards to OCU400 and was subsequently amended in September 2021 and November 2022 ("the Amendments"), to include OCU410 and OCU410ST, respectively. The Company concluded that the Original CanSinoBIO Agreement and the Amendments are separate agreements (collectively referred to as the "CanSinoBio Agreements"). Pursuant to the CanSinoBIO Agreements, the Company and CanSinoBIO are collaborating on the development of the Company's modifier gene therapy platform. CanSinoBIO is responsible for the chemistry, manufacturing, and controls development and manufacture of clinical supplies of such products and is responsible for the costs associated with such activities. CanSinoBIO has an exclusive license to develop, manufacture, and commercialize the Company's modifier gene therapy platform in and for the CanSinoBIO Territory, and the Company maintains exclusive development, manufacturing, and commercialization rights with respect to the Company's modifier gene therapy platform outside the Company Territory. Should any of the product candidates be commercialized in the CanSinoBIO Territory, CanSinoBIO will pay to the Company an annual royalty between mid- and high-single digits based on Net Sales (as defined in the CanSinoBIO Agreements) of the products included in the Company's modifier gene therapy platform in the CanSinoBIO Territory. The Company will pay to CanSinoBIO an annual royalty between low- and mid-single digits based on Net Sales of the products included in the Company's modifier gene therapy platform in the Company Territory. Accounting analysis and revenue recognition The Company determined the collaboration arrangements with CanSinoBIO, are within the scope of ASC 808 and has analogized to ASC 606 to account for CanSinoBIO's access to its IP as well as data generated in connection with the co-development activities to be undertaken by Ocugen. These elements of the arrangements are not distinct and are accounted for as a single performance obligation. The non-cash consideration to be received related to the Company's satisfaction of the performance obligation includes but is not limited to services related to chemistry, manufacturing, and controls development and manufacture of clinical supplies of such products through completion of pre-clinical, clinical, regulatory, and other commercialization readiness services. The estimated market value of the co-development services to be performed by CanSinoBIO, represents variable consideration that is included in the transaction price. The Company recognizes collaborative arrangement revenue over time using an input method using ratio of costs incurred to date compared to total estimated costs required to satisfy the performance obligation under the CanSinoBIO Agreements. The Company constrained the transaction price related to certain future co-development services, as it assessed that it is probable that the inclusion of such variable consideration could result in a significant reversal of cumulative revenue in future periods. Royalty revenue will be recorded as sales occur based on the agreed upon royalties. No such royalty revenue has been recorded to date. The variable consideration, which is based on continued successful development of our programs, is reevaluated at each reporting period and as changes in circumstances occur. The services provided by CanSinoBIO are recorded as research and development expense as incurred and the difference between the revenue and expense recognized is recorded on the Company's balance sheet as a contract liability within Accrued expenses and other current liabilities. The related revenue recognized was recorded in the consolidated statements of operations and comprehensive loss as collaborative arrangement revenue and was approximately $4.4 million and $4.1 million for the year ended December 31, 2025 and the year ended December 31, 2024, respectively. The related expense incurred for services provided by CanSinoBIO was recorded in the consolidated statements of operations and comprehensive loss as research and development expense and was approximately $2.0 million and $1.9 million for the year ended December 31, 2025 and the year ended December 31, 2024, respectively. The contract liability was $5.9 million and $8.4 million as of December 31, 2025 and December 31, 2024, respectively. Revenue recognized for the year ended December 31, 2025, that was included in the contract liabilities balances as of January 1, 2025 was approximately $4.4 million. Revenue recognized for the year ended December 31, 2024, that was included in the contract liabilities balances as of January 1, 2024, was approximately $4.1 million. License Agreement with Kwangdong Pharmaceutical, Ltd. The Company entered into a license agreement (“Kwangdong License”) with Kwangdong Pharmaceutical, Ltd ("Kwangdong") for the development and commercialization of the Company's modifier gene therapy product candidate OCU400 in September 2025. Pursuant to the Kwangdong License, Kwangdong gains the exclusive rights to commercialize and develop OCU400 in South Korea (“Kwangdong Territory”). Kwangdong is responsible for commercialization and regulatory approval in the Kwangdong Territory. The Company retains exclusive right to manufacture for Kwangdong. The Company will also provide additional support services to Kwangdong throughout the term of the agreement to support commercialization. In accordance with the Kwangdong License, the Company received an initial $0.8 million (net of tax) non-refundable fee and is entitled to additional milestone-based fees upon FDA and regulatory approval in the Kwangdong Territory as well as manufacturing-based fees upon shipment. The Kwangdong License also includes an option (“Repurchase Option”) for the Company to purchase the license back from Kwangdong for three times the amount of fees paid to date plus expenses. That option expires upon regulatory approval in Kwangdong Territory. Accounting Analysis and Revenue Recognition At contract inception, the Company evaluated the goods and services promised in the Kwangdong Agreement, including the license, access to certain technology and know‑how, support services, and future product manufacturing. The Company concluded that these promises are not distinct in the context of the contract, as Kwangdong cannot derive benefit from the license without the Company’s manufacturing and related support. Accordingly, the Company identified a single combined performance obligation, consisting of the manufacture and supply of OCU400, inclusive of the related license and support activities. At contract inception, the transaction price consisted of the $0.8 million upfront payment. All other forms of consideration, including regulatory and development milestones, sales milestone payments, and royalties, represent variable consideration. Because these payments are dependent on future regulatory approvals or sales in the territory — events that are outside the Company’s control and subject to significant uncertainty — the Company has fully constrained such amounts in accordance with ASC 606. The Company will include these amounts in the transaction price only when it becomes probable that a significant reversal of cumulative revenue will not occur. The Company will recognize revenue related to the Kwangdong Agreement at a point in time, when control of the manufactured product is transferred to Kwangdong. The specific point at which control transfers will be determined based on terms in the future supply agreement (e.g., title passage, shipping terms, acceptance provisions). No revenue was recognized under the Kwangdong Agreement during the year ended December 31, 2025, as the Company did not deliver any manufactured product and therefore did not satisfy any portion of the combined performance obligation. As of December 31, 2025, the Company recorded the $0.8 million upfront payment as deferred revenue, presenting it within other non-current liabilities on the consolidated balance sheet. This amount will be recognized as revenue once the Company fulfills its overall performance obligation by delivering the manufactured products to Kwangdong. NIAID Project NextGen Clinical trial support In October 2023, OCU500 was selected by the National Institute of Allergy and Infectious Diseases ("NIAID") Project NextGen for inclusion in clinical trials. Project NextGen is a $5 billion multi-government agency initiative to develop the next generation of vaccines and therapeutics to combat the spread of COVID-19. NIAID, with funding from Project NextGen, will cover the full cost of the clinical trials, including operations and related analysis. Ocugen will be responsible for providing clinical trial materials and upon completion will have full right of reference to the findings, which Ocugen believes will provide clinical evidence to support the further development of the Company’s lead mucosal vaccine candidate. The NIAID intends to initiate a Phase 1 clinical trial in the second quarter of 2026. Exclusive License Agreement with Washington University In September 2022, the Company entered into the WU License Agreement with Washington University, pursuant to which the Company was granted an exclusive, sublicensable, royalty-bearing license to patent rights for a mucosal COVID-19 vaccine, as well as a license to certain tangible research property and technical information necessary to exploit the patent rights within the United States, Europe, and Japan. The Company paid Washington University an initial license issuance fee of $1.0 million, which was recognized as research and development expense in the consolidated statement of operations and comprehensive loss during the year ended December 31, 2022. In January 2023, the Company amended the WU License Agreement to add the countries of South Korea, Australia, and China to the Mucosal Vaccine Territory, and in November 2023, the Company further amended the WU License Agreement to add Hong Kong to the Mucosal Vaccine Territory. In June 2025, the Company further amended the WU License Agreement to add Canada to the Mucosal Vaccine Territory. The Company is required to pay Washington University an annual license maintenance fee of $0.1 million, payments upon the achievement of certain development and commercial milestones in the aggregate amount of up to $37.0 million, and low single-digit percentage royalties on Net Sales of licensed products (as defined in the WU License Agreement). Pursuant to the WU License Agreement, the Company may make, have made, sell, offer for sale, use, market, promote, distribute, export, and import licensed products in the Mucosal Vaccine Territory. The Company will use commercially reasonable efforts to develop, manufacture, promote, and sell the licensed products in the Mucosal Vaccine Territory. Washington University maintains control of patent preparation, filing, prosecution, and maintenance. The Company is responsible for Washington University's out-of-pocket expenses related to the preparation, filing, prosecution, issuance, and maintenance of the licensed patent rights incurred pursuant to the WU License Agreement. The WU License Agreement will expire on a country-by-country basis and a licensed product-by-licensed product basis and end, separately in each such country and for each such licensed product, upon the latter of (a) the expiration date of the last valid claim, (b) the fifteenth (15th) anniversary of the date of the first commercial sale of a licensed product, or (c) the expiration of the last form of market exclusivity (as defined in the WU License Agreement), subject to the earlier termination of the WU License Agreement in accordance with its terms. In addition, the Company may terminate the WU License Agreement without cause by giving at least 90 days written notice. The WU License Agreement contains customary termination provisions in the event of an uncured material breach or upon certain corporate actions, including bankruptcy, receivership, or liquidation. Exclusive License Agreement with The Schepens Eye Research Institute, Inc. In December 2017, the Company entered into an exclusive license agreement with The Schepens Eye Research Institute, Inc. ("SERI"), which was amended in January 2021 (as so amended, the "SERI Agreement"). The SERI Agreement gives the Company an exclusive, worldwide, sublicensable license to patent rights, biological materials, and technical information for NHR genes Nuclear Receptor Subfamily 1 Group D Member 1 ("NR1D1"), NR2E3 (OCU400), RORA (OCU410 and OCU410ST), Nuclear Protein 1, Transcriptional Regulator ("NUPR1"), and Nuclear Receptor Subfamily 2 Group C Member 1 ("NR2C1"). The January 2021 amendment to the SERI Agreement additionally granted the Company rights in co-owned intellectual property pursuant to certain patents and provisional patents at the time of the amendment. Under the SERI Agreement, the Company may make, have made, use, offer to sell, sell, and import licensed products, and must use commercially reasonable efforts to bring one or more licensed products to market as soon as reasonably practicable. SERI maintains control of patent preparation, filing, prosecution, and maintenance. The Company is responsible for SERI's out-of-pocket expenses related to the filing, prosecution, and maintenance of the licensed patent rights. In the event that SERI decides to discontinue the prosecution or maintenance of the licensed patent rights, the Company has the right, but not the obligation, to file for, or continue to prosecute, maintain, or enforce such licensed patent rights. The Company has assumed prosecution of certain licensed patent rights under the SERI Agreement. The Company has paid annual maintenance of $25 thousand and $75 thousand in December 31, 2025 and 2024, and $750 thousand in milestone payments for the year ended December 31, 2024. Exclusive License Agreement with the University of Colorado In March 2014, the Company entered into an exclusive license agreement with the University of Colorado ("CU"), which was amended in January 2017 and clarified by a letter of understanding in November 2017 (as so amended and clarified, the "CU Agreement"). The CU Agreement gives the Company an exclusive, worldwide, sublicensable license to patents for OCU200 to make, have made, use, import, offer to sell, sell, have sold, and practice the licensed products in all therapeutic applications. Under the CU Agreement, the Company must use commercially reasonable efforts to develop, manufacture, sublicense, market, and sell the licensed products, and has assumed primary responsibility for preparing, filing, and prosecuting broad patent claims for OCU200 for CU's benefit. Further, the Company assumed primary responsibility for all patent activities, including all costs associated with the perfection and maintenance of the patents for OCU200. The Company has paid $20 thousand related to annual maintenance for the year ended December 31, 2025 and 2024, respectively.

The Company entered into a co-development and commercialization agreement with our collaboration partner CanSino Biologics, Inc. ("CanSinoBIO") with respect to the development and commercialization of the Company's modifier gene therapy product candidates, OCU400, OCU410, and OCU410ST. The co-development and commercialization agreement was originally entered into in September 2019 ("the Original CanSinoBIO Agreement") with regards to OCU400 and was subsequently amended in September 2021 and November 2022 ("the Amendments"), to include OCU410 and OCU410ST, respectively. The Company concluded that the Original CanSinoBIO Agreement and the Amendments are separate agreements (collectively referred to as the "CanSinoBio Agreements"). Pursuant to the CanSinoBIO Agreements, the Company and CanSinoBIO are collaborating on the development of the Company's modifier gene therapy platform. CanSinoBIO is responsible for the chemistry, manufacturing, and controls development and manufacture of clinical supplies of such products and is responsible for the costs associated with such activities. CanSinoBIO has an exclusive license to develop, manufacture, and commercialize the Company's modifier gene therapy platform in and for the CanSinoBIO Territory, and the Company maintains exclusive development, manufacturing, and commercialization rights with respect to the Company's modifier gene therapy platform outside the Company Territory.

Should any of the product candidates be commercialized in the CanSinoBIO Territory, CanSinoBIO will pay to the Company an annual royalty between mid- and high-single digits based on Net Sales (as defined in the CanSinoBIO Agreements) of the products included in the Company's modifier gene therapy platform in the CanSinoBIO Territory. The Company will pay to CanSinoBIO an annual royalty between low- and mid-single digits based on Net Sales of the products included in the Company's modifier gene therapy platform in the Company Territory.

The Company determined the collaboration arrangements with CanSinoBIO, are within the scope of ASC 808 and has analogized to ASC 606 to account for CanSinoBIO's access to its IP as well as data generated in connection with the co-development activities to be undertaken by Ocugen. These elements of the arrangements are not distinct and are accounted for as a single performance obligation.

The non-cash consideration to be received related to the Company's satisfaction of the performance obligation includes but is not limited to services related to chemistry, manufacturing, and controls development and manufacture of clinical supplies of such products through completion of pre-clinical, clinical, regulatory, and other commercialization readiness services. The

estimated market value of the co-development services to be performed by CanSinoBIO, represents variable consideration that is included in the transaction price. The Company recognizes collaborative arrangement revenue over time using an input method using ratio of costs incurred to date compared to total estimated costs required to satisfy the performance obligation under the CanSinoBIO Agreements.

The Company constrained the transaction price related to certain future co-development services, as it assessed that it is probable that the inclusion of such variable consideration could result in a significant reversal of cumulative revenue in future periods. Royalty revenue will be recorded as sales occur based on the agreed upon royalties. No such royalty revenue has been recorded to date. The variable consideration, which is based on continued successful development of our programs, is reevaluated at each reporting period and as changes in circumstances occur.

The services provided by CanSinoBIO are recorded as research and development expense as incurred and the difference between the revenue and expense recognized is recorded on the Company's balance sheet as a contract liability within Accrued expenses and other current liabilities. The related revenue recognized was recorded in the consolidated statements of operations and comprehensive loss as collaborative arrangement revenue and was approximately $4.4 million and $4.1 million for the year ended December 31, 2025 and the year ended December 31, 2024, respectively. The related expense incurred for services provided by CanSinoBIO was recorded in the consolidated statements of operations and comprehensive loss as research and development expense and was approximately $2.0 million and $1.9 million for the year ended December 31, 2025 and the year ended December 31, 2024, respectively.

The contract liability was $5.9 million and $8.4 million as of December 31, 2025 and December 31, 2024, respectively. Revenue recognized for the year ended December 31, 2025, that was included in the contract liabilities balances as of January 1, 2025 was approximately $4.4 million. Revenue recognized for the year ended December 31, 2024, that was included in the contract liabilities balances as of January 1, 2024, was approximately $4.1 million.

The Company entered into a license agreement (“Kwangdong License”) with Kwangdong Pharmaceutical, Ltd ("Kwangdong") for the development and commercialization of the Company's modifier gene therapy product candidate OCU400 in September 2025. Pursuant to the Kwangdong License, Kwangdong gains the exclusive rights to commercialize and develop OCU400 in South Korea (“Kwangdong Territory”). Kwangdong is responsible for commercialization and regulatory approval in the Kwangdong Territory. The Company retains exclusive right to manufacture for Kwangdong. The Company will also provide additional support services to Kwangdong throughout the term of the agreement to support commercialization. In accordance with the Kwangdong License, the Company received an initial $0.8 million (net of tax) non-refundable fee and is entitled to additional milestone-based fees upon FDA and regulatory approval in the Kwangdong Territory as well as manufacturing-based fees upon shipment. The Kwangdong License also includes an option (“Repurchase Option”) for the Company to purchase the license back from Kwangdong for three times the amount of fees paid to date plus expenses. That option expires upon regulatory approval in Kwangdong Territory.

At contract inception, the Company evaluated the goods and services promised in the Kwangdong Agreement, including the license, access to certain technology and know‑how, support services, and future product manufacturing. The Company concluded that these promises are not distinct in the context of the contract, as Kwangdong cannot derive benefit from the license without the Company’s manufacturing and related support.

Because these payments are dependent on future regulatory approvals or sales in the territory — events that are outside the Company’s control and subject to significant uncertainty — the Company has fully constrained such amounts in accordance with ASC 606. The Company will include these amounts in the transaction price only when it becomes probable that a significant reversal of cumulative revenue will not occur.

The Company will recognize revenue related to the Kwangdong Agreement at a point in time, when control of the manufactured product is transferred to Kwangdong. The specific point at which control transfers will be determined based on terms in the future supply agreement (e.g., title passage, shipping terms, acceptance provisions).

As of December 31, 2025, the Company recorded the $0.8 million upfront payment as deferred revenue, presenting it within other non-current liabilities on the consolidated balance sheet. This amount will be recognized as revenue once the Company fulfills its overall performance obligation by delivering the manufactured products to Kwangdong.

In October 2023, OCU500 was selected by the National Institute of Allergy and Infectious Diseases ("NIAID") Project NextGen for inclusion in clinical trials. Project NextGen is a $5 billion multi-government agency initiative to develop the next generation of vaccines and therapeutics to combat the spread of COVID-19. NIAID, with funding from Project NextGen, will cover the full cost of the clinical trials, including operations and related analysis. Ocugen will be responsible for providing clinical trial materials and upon completion will have full right of reference to the findings, which Ocugen believes will provide clinical evidence to support the further development of the Company’s lead mucosal vaccine candidate. The NIAID intends to initiate a Phase 1 clinical trial in the second quarter of 2026.

In September 2022, the Company entered into the WU License Agreement with Washington University, pursuant to which the Company was granted an exclusive, sublicensable, royalty-bearing license to patent rights for a mucosal COVID-19 vaccine, as well as a license to certain tangible research property and technical information necessary to exploit the patent rights within the United States, Europe, and Japan. The Company paid Washington University an initial license issuance fee of $1.0 million, which was recognized as research and development expense in the consolidated statement of operations and comprehensive loss during the year ended December 31, 2022. In January 2023, the Company amended the WU License Agreement to add the countries of South Korea, Australia, and China to the Mucosal Vaccine Territory, and in November 2023, the Company further amended the WU License Agreement to add Hong Kong to the Mucosal Vaccine Territory. In June 2025, the Company further amended the WU License Agreement to add Canada to the Mucosal Vaccine Territory. The Company is required to pay Washington University an annual license maintenance fee of $0.1 million, payments upon the achievement of certain development and commercial milestones in the aggregate amount of up to $37.0 million, and low single-digit percentage royalties on Net Sales of licensed products (as defined in the WU License Agreement).

Pursuant to the WU License Agreement, the Company may make, have made, sell, offer for sale, use, market, promote, distribute, export, and import licensed products in the Mucosal Vaccine Territory. The Company will use commercially reasonable efforts to develop, manufacture, promote, and sell the licensed products in the Mucosal Vaccine Territory.

Washington University maintains control of patent preparation, filing, prosecution, and maintenance. The Company is responsible for Washington University's out-of-pocket expenses related to the preparation, filing, prosecution, issuance, and maintenance of the licensed patent rights incurred pursuant to the WU License Agreement.

The WU License Agreement will expire on a country-by-country basis and a licensed product-by-licensed product basis and end, separately in each such country and for each such licensed product, upon the latter of (a) the expiration date of the last valid claim, (b) the fifteenth (15th) anniversary of the date of the first commercial sale of a licensed product, or (c) the expiration of the last form of market exclusivity (as defined in the WU License Agreement), subject to the earlier termination of the WU License Agreement in accordance with its terms. In addition, the Company may terminate the WU License Agreement without cause by giving at least 90 days written notice. The WU License Agreement contains customary termination provisions in the event of an uncured material breach or upon certain corporate actions, including bankruptcy, receivership, or liquidation.

In December 2017, the Company entered into an exclusive license agreement with The Schepens Eye Research Institute, Inc. ("SERI"), which was amended in January 2021 (as so amended, the "SERI Agreement"). The SERI Agreement gives the Company an exclusive, worldwide, sublicensable license to patent rights, biological materials, and technical information for NHR genes Nuclear Receptor Subfamily 1 Group D Member 1 ("NR1D1"), NR2E3 (OCU400), RORA (OCU410 and OCU410ST), Nuclear Protein 1, Transcriptional Regulator ("NUPR1"), and Nuclear Receptor Subfamily 2 Group C Member 1 ("NR2C1"). The January 2021 amendment to the SERI Agreement additionally granted the Company rights in co-owned intellectual property pursuant to certain patents and provisional patents at the time of the amendment. Under the SERI Agreement, the Company may make, have made, use, offer to sell, sell, and import licensed products, and must use commercially reasonable efforts to bring one or more licensed products to market as soon as reasonably practicable.

decides to discontinue the prosecution or maintenance of the licensed patent rights, the Company has the right, but not the obligation, to file for, or continue to prosecute, maintain, or enforce such licensed patent rights. The Company has assumed prosecution of certain licensed patent rights under the SERI Agreement. The Company has paid annual maintenance of $25 thousand and $75 thousand in December 31, 2025 and 2024, and $750 thousand in milestone payments for the year ended December 31, 2024.

In March 2014, the Company entered into an exclusive license agreement with the University of Colorado ("CU"), which was amended in January 2017 and clarified by a letter of understanding in November 2017 (as so amended and clarified, the "CU Agreement"). The CU Agreement gives the Company an exclusive, worldwide, sublicensable license to patents for OCU200 to make, have made, use, import, offer to sell, sell, have sold, and practice the licensed products in all therapeutic applications. Under the CU Agreement, the Company must use commercially reasonable efforts to develop, manufacture, sublicense, market, and sell the licensed products, and has assumed primary responsibility for preparing, filing, and prosecuting broad patent claims for OCU200 for CU's benefit. Further, the Company assumed primary responsibility for all patent activities, including all costs associated with the perfection and maintenance of the patents for OCU200. The Company has paid $20 thousand related to annual maintenance for the year ended December 31, 2025 and 2024, respectively.